Draw-off cock for boilers.



W. L. BELKNAP.

DRAW-OFF 000K FOR BOILERS.

APPLICATION FILED OCT. 21, 1909. 5 6.,

Patented May 31, 1910.

WITNESSES WILLIAM L. BELKNAP, OF BRIDGEPORT, CONNECTICUT.

DRAW-OFF COCK FOR BOILERS.

To all whom it may concern:

Be it known that I, TIL-LIAM L. BEL- KNAP, a citizen of the UnitedStates, and a resident of Bridgeport, in the county of Fairfield andState of Connecticut, have invented certain new and useful Improvementsin Draw-Off Cocks for Boilers, of which the following is aspecification.

My invention relates to draw-ofi cooks for boilers, and particularly tothat class of boilers connected with a hot water system for heatinghouses.

The object of my invention is to provide a cheap and efiicient stop toprevent accidentally withdrawing the valve plug entirely from itscasing.

With this object in view, my invention consists in forming the valvestop an in tegral part of the casing and primarily located above thevalve plug until the valve plug is seated, and is then bent down in thepath of the plug to prevent the complete withdrawal of the plug from thecasing.

Referring to the drawings, Figure 1 represents a central sectional viewof the casing or body of the cock showing the stop as an integral partof the body and primarily located at the entrance of the outlet port;Fig. 2 is a plan View of the upper surface of the outlet of the casinglooking in the direction of arrow at of Fig. l; and Fig. 3 is a centralsectional view of the cock body with the valve plug operatively mountedtherein with the stop bent downward and with which the valve end of theplug contacts when raised from its seat.

The valve body A has the threaded inlet port end 1 adapted to beconnected with a boiler (not shown) and the exteriorly threaded outletport 2, adapted to connect with a hose (not shown) for conveying awaythe water, and the interiorly threaded portion 3 to receive the threadedportion at of the plug and the valve seat 5 for the valve end 6 of theplug.

When the body is cast, the stop 7 will lie in a horizontal position andat the entrance of the outlet port 2 as shown at Fig. 1. This initialposition of the stop will leave a clear space below for the operationSpecification of Letters Patent.

Application filed October 21, 1909.

Patented May 31, 1910.

Serial No. 523,743.

of the necessary tools required for finishing the interior of the body,viz: forming the threaded part 3 and the valve seat 5. The plug is theninserted and the stop driven down far enough to contact with the valveend of the plug when such end has been removed far enough from its seatto give sufficient opening for the escape of water as shown atFig. 2.

- The construction shown comprises a body and valve plug only, and onaccount of its simplicity and cheapness is, with the exception of thestop feature, now in general use in connection with a hot water systemfor drawing off the boiler. In drawing olf a boiler, a hose 'is attachedto the outlet of the cock and the plug turned back to unseat the valve.As the discharge end of the hose is generally located in a sink or otherlike place out of sight of the operator, there is no means ofdetermining when the valve is fully opened, and, conse quently, the plugis frequently entirely withdrawn, or so nearly so that the action of thewater will soon force it out and flood the cellar. To provide a suitablestop for the valve without adding materially to the cost of so cheap anarticle as the ordinary drawolf cock, has heretofore been a difficultmatter to accomplish. The stop as above shown and described adds nothingto the cost of construction, is out of sight and thoroughly effectivefor draw-off cocks of all descriptions.

Having thus described my invention, what I claim is A draw off valvecock comprising a body having inlet and outlet ports and a valve seatand an adjustable valve plug for the seat, and a member integral withthe body and positioned to serve as an outer stop for said plug, themember having been sopositioned after the insertion of the plug.

Signed at Bridgeport in the county of Fairfield and State of Connecticutthis 20th day of Oct. A. D. 1909.

WILLIAM L. BELKNAP.

Witnesses:

H. A. LAMB, GEO. D. PHILLIPS.

